I don't mind at all that it's not bricks - it gives me a change of scene too :o)

I like this - a lot. Your lines suggest both texture and form and I feel you really sculpted it - saw the bumps and hollows appear and refined them as you worked.

The only thing I would have like to see is just one deep black. That would expand the contrasts and add solidity. Your darks beneath the top rock are good, but somewhere I think you could have pushed that area right back into the shade - perhaps a narrow gap between that rock and the one beneath. However you engineer it, it's always worthwhile getting a black in there somewhere.

Other than that, this is really looking good. And maybe the Leopard Cub once you've covered the Hair weeks :o)